Getting Stream init failed: DOMException error when running most basic example

Hello, I am running the first example extensions-getting-started

The error I get in the console is

Stream init failed: DOMException: Failed to execute ‘postMessage’ on ‘Window’: Invalid target origin ‘’ in a call to ‘postMessage’.

Could somebody help me?

Thank you

This error is irrelevant to extension development

It’s a security error relating to the player testing if it’s in an iframe or not and can be ignored

I will delete the question then, so it’s not spamming the forum with irrlevant stuff

It’s fine to leave it.

Other people often have the question.

It’s just not something you yourself can fix and it’s not really a “bug”